Filter



(No Modem K. KIEFER.'

FILTER.,

Patented Mar. `30, 1897.

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KARL KIEFER, or CINGINNATT, omo.

FILTER.

SPECIFICATION forming part of Letters Patent No. 579,586, dated March 30, 1897. Application filed May 22, 1896. Serial No. 592,675. (No model.)

To all whom, t may concern:

Be it known that I, KARL KIEFER, a citi- Zen of Germany, and a resident of Cincinnati, in the county of Hamilton, in the State of Ohio, have invented a new and useful Filter, of which the following is a description.

My invention relates to improvements in paper or similar pulp as a filtering medium.

The objects of myimprovements are, first, to simplify the construction of such a filter; second, to effect an even homogeneous layer of pulp, and, third, to simplify the operation of filtering. I attain these objects principally by using a speciallyconstructed filteringplate, which is illustrated by the accompanying drawings.

Figure l is a vertical section of the entire machine. Fig. 2 is a top view of half a plate. The other halt` is symmetrical and is not shown on account of limited space.

Similar letters refer to similar parts throughout the views.

The top plate A and the bottom plate B, held together by bolts, are the elements between which the filtering-plates C C are contained. Of the filtering-plates there may be one or more applied without changing the working of the apparatus, only different-sized bolts have to be used.

I will give a description of the most important part-the tiltering-plate-irst, and then describe the operation of the machine afterward.

The filtering-plate C has the shape of a circular plate, with a proportionately low cylindrical border on its periphery. The center of the plate has the opening a. Concentrically with the opening n there is another low cylindrical wall of about the same height as the outside border. The ring-shaped space between these two borders serves for the reception of the pulp mass 'L'. The bottom of this ring-shaped space is cut out in the shape of concentrical rings whose cross-sec tion is similar to the cross-section of a thread. They are plainly shown in Fig. 2. These thread-like rings are intersected by channels f. The prolongations of the channels f are small holes h, which connect the ringshaped space between the borders with the central opening n. The top and bottom of the outside border, also the top and bottom of that part of the filtering-plate surrounding the opening n, are formed to receive the ringshaped gaskets d and e, by means of which the two filtering-plates can be tightened, respectively, so as to prevent any liquid contained within the filtering-plate to escape outside the vcylindrical borders and in the opening n.

The ring-shaped space of the filtering-plate C between the inner borders and that central part carrying the gasket e is perforated with vertical holes 7c, which, however, do not cross the small holes 7i, but are suitably placed be tween them.

The opening m in the bottom plate B serves for the admission of cloudy liquid.

The opening n in the bottom plate corresponds with the central opening of all the filtering-plates O.

Before I go to a description of the operation of the machine as a whole I will describe how to produce the ring-shaped mass of pulp '1l in the filtering-plate- A ring-'shaped diaphragm g is put on top of the threaded part of the filtering-plate. (This diaphragm may consist of muslin or fine metal gauze.) Then a certain amount of paper-pulp, which has been previously dissolved in water, is poured on top of the diaphragm. The water contained in the pulp will then soak through the diaphragm, but the fibers of the paper are retained, the holes of the diaphragm being too small for them to pass through. The pulp mass t' now forms a loose layer on top of the diaphragm between the cylindrical borders. This loose layer now is exposed to the pressure from above by a suitable press-plate pressing all the water out of the pulp and forming the homogeneous layer t between the cylindrical borders. The water pressed out of the pulp and later on also the liquid to be filtered have to go through the diaphragm in the triangular channels formed by the thread s,from there to the intersecting channels f, and through the openings 7i in the central hole n.

The operation of the filter is as follows: One or more filtering-plates having been provided with a pulp layer in the described manner, they are put on the base plate B with gaskets e and d between the borders or" each other and covered with the top plate A. Then IOO the top and base plates are drawn together by means of bolts.. The liquid then enters at m, rises through hydrostatic pressure through the holes 7c of all the filtering-plates, (indicated on plate C by means of arrows.) The plates are so constructed that when put together there is a little space between the inside border Z and the bottom part of the plate above through which t-he liquid to be filtered can get over the pulp layer of each filtering-plate. The liquid now passes through the filtering medium, leaving all impurities in same, then through the thread-like rings of the filteringplate, and collects at the channels f, and from there through the holes h to the central opening n of the machine.

It is readily to be seen from the drawings that the central openin g n is sufficiently separated from the ascending cloudyli quid by means of gaskets e. The openings 'm and n may also be in the top plate Without changing the working of the lter.

The number of channels f in the filter need not be six, as shown in the drawings, but may be unlimited.

Instead of bolts, as shown in the drawings, other means to tighten the apparatus may be chosen.

Some of the advantages attained by the aforegoing-described invention are that, first, the pulp layer of the ltering-plate C can be pressed nearly dry, as the threads of the filtering-plate withstand any pressure exerted upon them; second, the filtering-plates are interchangeable; third, for small quantities of filtered liquid a few maybe used, and more for large quantities; fourth, the capacity of the machine compared with the filtering-surface is reduced, and, fifth, the liquid to be filtered passes over the pulp layers evenly.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

l. In aiilteracombination of a bottom plate and a top plate, with an inlet and outlet constituting a frame, and one or more congruent and interchangeable circular filtering-plates with inlets and outlets centrally and symmetrically arranged, and containing the filtering medium in a ring-shaped flat layer, said ltering-plates having ring-shaped corrugations in'their bottom part against which the filtering medium rests; substantially as set forth above. y

2. In a filter a combination of a bottom plate and a top plate, with an inlet and outlet constituting a frame, and one or more congruent and interchangeable circular filtering-plates with inlets and outlets centrally and symmetrically arranged, and containing the filtering medium in a ring-shaped flat layer, said plates having ring-shaped corrugations serving as outlet-channels for the clear liquid in- I KARL KIEFER.

lVitnesses:

CHAs. L. RICHTER, EMILE KAHN. 

